Johannes gkimhe



2 lSheets-Shewt 2.

(No Model.)

J GRIMME DRIVING MBGHANISM. No. 561,260.

Patented'June 2, 1896.'

W/'l'hessessr Jn ven/'an Morra-gy Jai/LJ@ -UNiTED STATES PATENT OEEICE.

JOHANNES GRIMME, OF BOCHUM, GERMANY.

DRIVING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 561,260, dated J' une2, 1896.

Application tiled February 10, 1896. Serialrlo. 578,738. (No model.)

To all whom it .may concern,.-

Beit known that I, JOHANNES GRIMME, a subject of the German Emperor,residing at Bochum, Vestphalia, in the Kingdom of Prussia, and GermanEmpire, have invented certain new and useful Improvements in DrivingMechanism; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to a mechanism, actuated by the machinery withwhich it is connected, which enables the speed of moving parts actuatedfrom a crank-shaft to be varied at will, or to enable them to be stoppedaltogether, without in any way interfering with the motion of thecrank-shaft itself.

Figure l of the accompanying drawings shows the mechanism in combinationwith one of the well-known reciprocating drivinggears, of which Fig. 2shows a vertical section. Fig. 3 shows a front view of the mechanism.for varying the speed. Figs. 4 and 5 show side views of modifications ofthe construction shown at Fig. 2.

The crank a of the shaft revolving in the bearings 7c carries a guide inwhich a slide carrying the crank-pin b can be shifted by means of ascrew-spindle c. This screw-spindle c carries at the end next the shaftabevelpinion o', gearing with two other bevel-pinions d and e, Fig. 3.The latter two are fixed on shafts situated concentrically within thecrank-shaft, with their other ends projecting from the latter, and onthese ends are fixed the friction-disks f and g. Over these disks issituated a T-headed lever h, pivoted to a fixed support at i, the longerarm of which lever serves as a hand-lever while the two short arms carrybrake-blocks f g', pivoted thereto in such manner that on moving overthe lever h to the one side or the other either the friction-disk f isheld stationary by the block f or the friction-disk gis held stationaryby the block g. From this arrangement it will be seen that by therotation of the crank-shaft driven by a bell-pulley t or otherwise thetwo pinions d e, and consequently the disks f g, will also be carriedround thereby. If, however, by moving over the lever 7L one of the twodisks f and g, and consequently the pinion fixed to its shaft, be heldstationary, the pinion c', fixed on the screwspindle c, will be causedto roll round upon the stationary pinion, and consequently the crank-pinb will be shifted toward or from the crank-shaft.

According as the stroke of the crank is lengthened or shortened by suchshifting of the crank-pin, the peripheral speed of the latter will beincreased or decreased, and in consequence thereof the mechanisms whichare actuated by the crank-pin will be made to -move with a correspondingincreased or decreased speed. The adjustment of the crankpin b is soarranged that the speed can be reduced to zero by bringing the center ofthe crank-pin in the axial line of the shaft. In this position allmovement of the driving-gear connected to the crank will cease althoughthe crank-shaft continues to rotate at its original speed.

In the drawings the above-described mechanism is combined with anarrangement which admits of a reversal of the motion independently ofthe change of speed. This arrangement consists, as shown at Figs. l and.2, of a lever m, mounted loose on the shaft o,

the free end of which lever is connected by a connecting-rod Z with thecrank-pin o.

By the rotation of the crank-shaft @the lever m will receive areciprocating motion, the extent of such motion depending upon thestroke, for the time being, of the crank a..

On the lever 'm are mounted two opposite pawls p and q, pivot-ed toleverm at r, one of which pawls-for example, p-is shown in the drawingsgearing with the V-shaped groove of a friction-disk n, fixed on theshaft o, so that at each stroke of lever m to the left hand thefriction-disk n and shaft o will be rotated through a correspondingangle, while on the movement of lever m to the right the pawl p willslide over the disk fn.

By making the pawl q gear with the friction-disk 'n in place of pawl pthe direction of rotation of the shaft will be reversed.

For producing a uniform rotary motion of shaft o this is provided with afly-wheel s. When greater power has to be transmitted, the frictionratchet device can be replaced by a toothed ratchet mechanism u, asshown at Fig. 4, and in place of transmitting the mo- IOO tion by aconnecting-rod and lever it maybe effected by a toothed rack fv andspur-wheel w, as shown at Fig. 5.

l As by the alteration of the stroke of the crank a the stroke of thelever m is also altered, while the speed of the crank-shaft remains thesame, there will of course result a change of speed of the shaft o, asthe lever 'm must perform its larger strokes in the saine time as itssmaller strokes.

It will be evident that in place of the frietion-disks f and g and theirbrake-blocks f g any equivalent known mechanism, such as ratchet-wheelsand pawls, may be employed.

Having now particularly described and ascertained the nature of the saidinvention and in what manner the same is to be performed, l declare thatwhat I claim is* l. The combination, with a hollow crankshaft, of asleeve journaled therein, a shaft jonrnaled in the said sleeve, a cranksecured on the end of the crank-shaft, beveled toothed wheels securedrespectively on the said shaft and sleeve at the hub of the crank, ascrewthreaded spindle journalcd in the crank and provided with a beveledtoothed wheel gearing into both the aforesaid wheels, a crankpinslidable radially in the said crank and engaging with the said spindle,brake-wheels secured respectively on the said sleeve and shaft, apivotedhand-lever, and brake-blocks pivoted to the said hand-lever andoperating lo bear alternately on the said brake-wheels, whereby thethrow of the said crank-pin may be varied or reduced to zero,substantially as set forth.

2. The combination, with a shaft, a iiywheel secured thereon anoscillatory lever m, and ratchet mechanism operatively con neeting thesaid lever with the shaft; of a hollow crank-shaft provided with a crankat one end, a screw-threaded spindle journaled in the said crank, aslidable crank-pin engaging with the said spindle, a sleeve and aninternal shaft journaled in the hollow crankshaft, beveled toothedwheels connecting the said sleeve, spindle, and internal shaft;brake-wheels secured respectively on the said sleeve and internal shaft,and means for arresting the motion of the said brake-wheels alternatelyand thereby varying the speed of the first said shaft by changing thethrow of the crank-pin, substantially as set forth.

3. The combination, with a hollow crankshaft provided with a crank atone end, of a crank-pin slidable radially in the said crank, ascrew-threaded spindle journaled in. the said crank and engaging withthe said crankpin, a sleeve and an internal shaft journaled in thehollow crank-shaft, beveled toothed wheels connecting the said sleeve,spindle, and internal shaft, brake-wheels scoured respectively on thesaid sleeve and internal shaft, and a pivoted hand-lever provided withbrake-blocks adapted to bear alternately 011 the said brake-wheels, andoperating to vary the throw of the crank-pin, substantially as setforth.

In testimony whereof I have affixed my signature in presence of twowitnesses.

JOHANNES GRIMME.

W'itnesses:

H. F. lIEss, L. RORIG.

